Across the world, billions of people hold the belief that God has spoken to humanity through a human intermediary, with teachings that should be the basis for individual and social life. Perhaps the greatest challenge that could be presented to a human being then, is a claim by another individual that He too, was sent by God with a Message that can heal the ills afflicting society.

These selections from the writings of Bahá'u'lláh, the Báb, 'Abdu'l-Bahá, Shoghi Effendi, and the Universal House of Justice discuss the proofs of this claim.